Boiler-furnace



(No Model.)

K. SCHROLL.

BOILBR FURNACB.

Patented Oct. 31,

amanti KARL SCHROLL, F CHICAGO, ILLINOIS.

BOILERHFURNACE.

SPECIFICATION forming part of Letters Patent No. 266,648, dated October 31, 1882. Application led June 13, 1882. (No model.)

had to the accompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

rlhis invention relates to the construction of boiler-furnaces; and it has for its object to produce a furnace which is self-feeding, and inA which will be produced, as near as possible, a perfect combustion of the gases, and that will prevent smoke.

The invention consists in a furnace built in front of the boiler, and having a half-V grate in an arch built over such grate, that has openings in its sides for feeding` the fuel, and airvents in its center 5 in an open fuel-receptacle above such arch; in a gas-duct leading from between the grate and the arch under the boiler, and in a series of air-vents above the gas-duct leading from the coal-receptacle to under the boilers, all as more fully hereinafter described and specically claimed.

In the accompanying drawings, Figure l represents a longitudinal vertical section, and Fig. 2 a vertical cross-section, of my boiler-furnace.

Corresponding letters in the several figures of the drawings designate like parts.

A denotes the ash-pit, provided with door a,- B, the bottom grate, consisting of longitudinal bars or perforated plates that are supported at both ends upon suitable bars or plates,b. This grate is only about one-half the entire width of the furnace, and is placed longitudinally in the center of the same. Grates C, each composed of a series of vertically-inclined bars, cover the spaces at each side between the grate B and the side walls,D,of the furnace.

An arch, E, built of fire-brick, is struck between the side walls, D, a short distance above the grates. This arch E has a series of semielliptical openings, d, at the sides, through which the fuel will feed downward upon the grat-es from both sides, and has air-vents e in or through its crown.

A door, f, in front wall, F, of the furnace is for kindling and poking the iire in the combustion-chamber that is between the grates and the archq The bridge-wall H supports the front end of the boiler I, and achannel,J, leads from the combustion-chamber under the boiler for conducting the burning gases to be brought in contact with such boiler.

The side walls, I), front F, and bridge-wall H are sufficiently extended upward above the arch E to form the fuel-chamber K, which is to remain open on top. A series of vents, g, are built into lthe bridge-wall H above arch E and below boiler I for admitting jets or currents ot' air to admix with the burning gases that issue through duct J.

A ijre being started on the grates B and C, andthe fuel-chamber K being kept filled sufficiently with fuel, such fuel will slide downward through openings d as fast as the fuel upon the grates is being consumed, and will be decomposed or coked in its down passage by the heat from the tire on the grates. The gases thus generated will come in contact with the incandescent coal on the grates by passing over the same on its passage to the channel J. Sufficient air is admitted through vents cto intermingle with the gases that enter through openings d to facilitate combustion, which air first must pass through the fuel, and will carry with it any vapors or fume that may rise from such fuel. The air passing through vents g will take up the destructive heat from the bridge-wall,will thereby become highly heated itself, and will then iutermingle with the burning gases under the boiler to furnish additional oxygen for bringing about a perfectcombustion of such gases, and thereby to prevent the generation of smoke.

The entire furnace is built in front of the boiler, and only the clear-burning gases are brought in contact with the heating-surface of such boiler.

In a boiler-furnace, the combination of ashpit A, grate B, and inclined grates C, arch E, having feed-openings d and air-vents e, fuelchamber K, and bridge-wall H, having channel J and air-vents g, the whole being constructed and arranged substantiallyin the manner and for the purpose set forth.

In testimony that I claim the foregoing as my invention I affix my signature in presence of two witnesses.

KARL SOIIROLL. Witnesses:

H. HENEHL, R. G. ScnMrD.

IOO 

